Safety device for preventing railway accidents



April, 1926 1,666,695

H. G REBEHEM SAFETY DEVICE FOR PREVENTING RAILWAY ACCIDENTS Filed Siam 24. 1927 klgxgw Patented Apr. 17, 1928 UNITED STATES HUGO GREBEHEM, OF HERBSLEBEN, GERMANY.

SAFETY DEVICE FOR PREVENTING RAILWAY ACCIDENTS.

Application filed March 24, 1927, Serial No. 178,081, and in Germany .Tune 30, 1926.

This invention relates .to an automatic safety device for preventing a train overrunning the signal: line blocked in foggy weather or for any other reasons, and thereby afiording an absolutely reliable protection against railway accidents. The essence of the invention consists in the provision of means by which with pulled signal: line I blocked the compressed-air brakes of the 0 train are automatically operated and thus the train stopped.

The accompanying drawing illustrates the improved safety-device by way of example: Fig. 1 is an edge view of the same partlyin section, Fig. 2 is a side view of the same, and Fig. 3 shows a detail of Fig. 1 on a larger scale.

One of the-locomotive wheels of a train is fitted on its outer side with a fixed concentric metal rim a, which is provided with a plurality of radial borings, in each of which a bolt 6 is located and acted-upon by a strong spiral spring 0 in such a way that it normally projects somewhat from the outer periphery of the rim a. In a recess (Z of the rim a provided beside each boring therein, a horizontal lever arm 6 is located so as to bear with its free inner end by action of a spring 9 upon the inner end of said bolt, while its outer end is pivoted to a radial lever 7, which at its other slotguided end is connected with a valve-plug 72 adapted to shut-oft a steam pipe 2' in one of its end positions. All said steam pipes 71 are at their inner ends in communication with a common closed central cap k to which a steam supply pipen is attached. \Vit'h n said cap 70 a closed bush k is located, into which lead the inner ends of two pipe-s Z. The outer ends of all said steam pipes 71 and of said pipes Z lead into a circular pipe on located on the inner periphery 0t therim a and allowing a free circulation of the steam therethrough and a separate function of each single bolt 6. v

On the outside of the permanent railway line, a metal bar 0 with declined ends 0 is so adjustably arranged that with pulled signal: line blocked it is placed within the path of and in level with the outer periphcry of said rim a and then adapted to function as hereinafter described. while with tree line signal it is moved beyond reach ofsaid rim and then does not act upon the same. v

The operation with pulled signal: line blocked and corresponding adjustment of the bar 0 is astollows:

All the bolts 6 are by said bar '0 successively forced inward-s against the action of their springs 0, whereby the levers e. are so moved that the valves h are opened and steam supplied through pipe a is allowed to flow from'the cap I} through the pipes 2' to the circular pipe m and hence through the pipes Z into the closed bush from which a pipe n leads to the compressed-air brakes of the train, the latter being thereby stopped.

The bolts 6 after having passed over the bar 0 return by action of their springs c N to their initial position,'while for returning also the valves hinto the latterposition first the steam supply through the pipe 71.

must be stopped by the conductor of the 10- comotive, whereupon the levers c, f with the Valves it are moved back by action of their springs a. 1

.VVhat I claim, is:

A safety-device for preventing trains overrunning the-signal: line blocked, comprising, in combination, a fixed rim on the outer side of oneof the locomotive wheels o'ta train having radial borings therein. sprinsrpressed bolts in saidborings adapted to normally proiect somewhat from the outer pcriphery of said rim, spring-messed linked levers at one end 1n contact w th the nner ends of said bolts, valves in connection with the other slot-guided-ends of said levers. a

steam supply pipe system leading to the compressed-air brakes of the train and normally shut-off by said valves, and an adjust able bar with declined ends on the permanent railwav'line placed with pulled signal: line blocked within the path. of and in level with the outer periphery of said rim and then adapted to operate said bolts and therebyto open said valves and to free the steam supply therethrough.

In testimony whereof I have hereunto set my hand.

HUGO GREBEHEM. 

